Beam Extraction from a Large Vacuum-immersed Negative-ion Source
Beam Extraction from a Large Vacuum-immersed Negative-ion Source
复制标题
从大型真空浸入式负离子源中提取光束
DOI：
10.1063/1.1145056
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发表时间：
1994
期刊：
影响因子：
--
通讯作者：
T. Kuroda
中科院分区：
文献类型：
--
作者：
Y. Takeiri;Y. Oka;O. Kaneko;A. Ando;K. Tsumori;R. Akiyama;T. Kawamoto;T. Kuroda
为发展大型螺旋装置的中性束注入系统，研制了一台大型真空浸没负离子源。真空浸没光源的结构紧凑、重量轻，因为它不受大气压力的影响。因此，这对于大规模离子源来说是非常有利的。此外，由于加速器的栅极由后绝缘体支撑，栅极之间的间隙有望得到加强抽运，从而减少负离子的剥离损失。计算了网格间的气体压力分布，估算了H-−离子的溶出损失，证实了真空浸没源结构的有效性。并用蒙特卡罗程序考虑了气体压力分布的温度效应。
A large vacuum‐immersed negative‐ion source has been investigated for the development of the neutral beam injection system in a large helical device. The structure of the vacuum‐immersed source is compact and light because it is free from atmospheric pressure. Therefore, this is very advantageous for a large‐scaled ion source. Moreover, since the grids of the accelerator are supported by post insulators, enhanced pumping of gaps between grids is expected, leading to a reduction of stripping loss of negative ions. The gas pressure distribution between grids was calculated and the stripping loss of H− ions was estimated and the effectiveness of the vacuum‐immersed source structure was confirmed. The gas temperature effect of the gas pressure distribution is also considered by using a Monte Carlo code.